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Origin, Evolution and Homologies of the Weberian Apparatus: a New Insight

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Origin, Evolution and Homologies of the Weberian Apparatus: a New Insight Int. J. Morphol., 27(2):333-354, 2009. Origin, Evolution and Homologies of the Weberian Apparatus: A New Insight Origen, Evolución y Homologías del Aparato Weberiano: Un Nuevo Acercamiento Rui Diogo DIOGO, R. Origin, evolution and homologies of the Weberian apparatus: a new insight. Int. J. Morphol., 27(2):333-354, 2009. SUMMARY: The Weberian apparatus is essentially a mechanical device improving audition, consisting of a double chain of ossicles joining the air bladder to the inner ear. Despite being one of the most notable complex systems of teleost fishes and the subject of several comparative, developmental and functional studies, there is still much controversy concerning the origin, evolution and homologies of the structures forming this apparatus. In this paper I provide a new insight on these topics, which takes into account the results of recent works on comparative anatomy, paleontology, and ontogeny as well as of a recent extensive phylogenetic analysis including not only numerous otophysan and non-otophysan extant otocephalans but also ostariophysan fossils such as †Chanoides macropoma, †Clupavus maroccanus, †Santanichthys diasii, †Lusitanichthys characiformis, †Sorbininardus apuliensis and †Tischlingerichthys viohli. According to the evidence now available, the Weberian apparatus of otophysans seems to be the outcome of a functional integration of features acquired in basal otocephalans and in basal ostariophysans, which were very likely not directly related with the functioning of this apparatus, and of features acquired in the nodes leading to the Otophysi and to the clade including the four extant otophysan orders, which could well have been the result of a selection directly related to the functioning of the apparatus. KEY WORDS: Evolution; Functional anatomy; Ostariophysi; Otocephala; Otophysi; Phylogeny; Teleostei; Weberian apparatus. INTRODUCTION The Weberian apparatus is one of the most notable provided a recent review on the comparative anatomy, complex systems of teleost fishes (Weber, 1820). It is found functional morphology and evolution of the Weberian in extant otophysans, i.e. cypriniforms, characiforms, apparatus. Some parts of the overview provided in the siluriforms and gymnotiforms, but, as will be explained present paper are based in Chardon et al.'s work. However, below, was seemingly present in a 'plesiomorphic' form in there are significant differences between this paper and basal, now extinct, otophysan fishes such as †Chanoides that work. One of the main differences is that this overview macropoma, †Clupavus maroccanus, †Santanichthys also takes into account several works that have provided diasii, and †Lusitanichthys characiformis (see Fig. 1) (e.g. relevant information on the subject after the writing of Gayet, 1981, 1985, 1986a, 1986b; Patterson, 1984; Taverne, Chardon et al’s (2003) paper, which, thus, were not 1995, 2005; Cavin, 1999; Filleul & Maisey, 2004). The considered in that paper (e.g. Grande & Shardo, 2002; apparatus (Figs. 2-6) is essentially a mechanical device Grande & Braun, 2002; Coburn & Chai, 2003; De Pinna improving audition, consisting of a double chain of ossicles & Grande, 2003; Filleul & Maisey; Grande & Young, 2004; joining the air bladder to the inner ear, associated with a Grande & De Pinna, 2004; Taverne, 2005). But the most modification of the pars inferior of the labyrinths of the significant original contribution of the present paper is that inner ear and of the anterior portion of the swimbladder it presents a discussion on the homologies and evolution (camera aerea Weberiana) (e.g. Weber; Sagemehl, 1885; of the Weberian apparatus that is directly based on the Bridge & Haddon, 1894; Schreiber, 1935; Franz, 1937; phylogenetic results of an extensive cladistic analysis Poggendorf, 1952; Kleerekoper & Roggenkamp, 1959; including not only representatives of the four extant Alexander, 1961ab, 1964ab, 1965; Chardon, 1968; Weiss otophysan orders, of the Gonorynchiformes and of the et al., 1969; Vandewalle, 1975). Chardon et al. (2003) Clupeomorpha, but also ostariophysan fossils such as Department of Anthropology, George Washington University, Washington DC, USA. 333 DIOGO, R. Origin, evolution and homologies of the Weberian apparatus: a new insight. Int. J. Morphol., 27(2):333-354, 2009. †Chanoides macropoma, †Clupavus maroccanus, complete, broader view on the phylogeny and evolution of †Santanichthys diasii, †Lusitanichthys characiformis, the otophysans and their closely related groups, thus †Sorbininardus apuliensis and †Tischlingerichthys viohli allowing, for example, to cladistically tracing the homologies (Diogo, 2007; see Fig. 1). This thus allows having a more and evolution of some key Weberian structures. Fig. 1. Phylogenetic relationships of representative extant and fossil otocephalans, modified from Diogo (2007) (the nomenclature of the taxa included in the cladogram follows that of Diogo's 2007 work). 334 DIOGO, R. Origin, evolution and homologies of the Weberian apparatus: a new insight. Int. J. Morphol., 27(2):333-354, 2009. MATERIAL AND METHOD setirostris: MNCN 49294, 2 (alc). Ostariophysans: Bagrus bajad: LFEM, 1 (alc), 1 (c&s). Bagrus docmak: MRAC 86- 07-P-512, 1 (alc). Barbus barbus: LFEM, 1 (c&s). Barbus The phylogenetic framework for the discussions guiraonis: MNCN 245730, 3 (alc). Brachyhypopomus provided in the present paper is based on the results of a recent brevirostris: LFEM, 2 (alc). Brachyhypopomus sp: INHS cladistic analysis of teleostean higher-level phylogeny 89761, 2 (alc). Brycon guatemalensis: MNCN 180536, 3 including 271 phylogenetic osteological and myological (alc). Brycon henni: CAS 39499, 1 (alc). Callichthys characters and 70 extant and fossil terminal taxa; the results callichthys: USNM 226210, 2 (alc). Catostomus obtained for the Otocephala clade (clupeomorphs + commersonii: MNCN 36124, 10 (alc). Citharinus sp.: 86- ostariophysans) are shown in Figure 1. The actinopterygian 016-P-72, 3 (alc). Cetopsis coecutiens: USNM 265628, 2 specimens examined for the present study are from the (alc). Chanos chanos: USNM 347536, 1 (alc), LFEM, 1 (alc). Laboratory of Functional and Evolutionary Morphology of Chrysichthys auratus: UNB, 2 (alc). Chrysichthys the University of Liège (LFEM), the Museo Nacional de Cien- nigrodigitatus: LFEM, 1 (c&s). Cobitis paludica: MNCN cias Naturales de Madrid (MNCN), the American Museum 248076, 7 (alc). Cromeria nilotica: MRAC P.141098, 2 (alc). of Natural History (AMNH), the Academy of Natural Sciences Danio rerio: MNCN, 10 (alc). Diplomystes chilensis: LFEM, of Philadelphia (ANSP), the Chinese Academy of Sciences 3 (alc). Distichodus notospilus: MRAC A0-048-P-2630, 3 at Wuhan (CASW), the California Academy of Sciences (alc). Gonorynchus gonorynchus: LFEM, 2 (alc). (CAS), the Illinois Natural History Survey (INHS), the Musée Gonorynchus greyi: FMNH 103977, 1 (alc). Grasseichthys Royal de l'Afrique Centrale (MRAC), and the National gabonensis: MRAC 73-002-P-264, 3 (alc). Gymnotus Museum of Natural History (USNM). The list of specimens carapo: INHS 35493, 2 (alc). MNCN 115675, 2 (alc). Kneria is given below; the trypsine-cleared and alizarine-stained wittei: MRAC P-33512, 2 (alc). Nematogenys inermis: (c&s) or alcohol fixed (alc) condition of these specimens is USNM 084346, 2 (alc). Opsariichthys uncirostris: MNCN given in parentheses following the number of specimens 56668, 3 (alc). Parakneria abbreviata: MRAC 99-090-P- observed. Dissections were made using a Wild M5 dissecting 703, 3 (alc). Phractolaemus ansorgii: MRAC P.137982, 3 microscope equipped with a camera lucida. The information (alc). Pimelodus blochii: LFEM, 2 (alc), 1 (c&s). Silurus regarding the fossil taxa mentioned in the text is based on an aristotelis: LFEM, 2 (alc). Silurus glanis: LFEM, 2 (alc). extensive overview of the literature available (e.g. Taverne, Sternopygus macrurus: CAS 48241, 1 (alc); INHS 62059, 2 1995, 1999; Gayet, 1981, 1985; Patterson; Filleul & Maisey). (alc). Trichomycterus areolatus: LFEM, 2 (alc). Xenocharax The nomenclature of the anatomical structures discussed in spilurus: MRAC A0-048-P-2539, 3 (alc). Euteleosts: the present paper follows that of Diogo (2007). Alepocephalus rostratus: MNCN 108199, 2 (alc). Argenti- na brucei: USNM 239005, 2 (alc). Argentina sphyraena: Non-teleostean actinopterygians: Acipenser sturio: MNCN 001134, 12 (alc); MNCN 78530, 5 (alc). Astronesthes MNCN 152172, 3 (alc). Amia calva: MNCN 35961, 1 (alc), niger: MNCN 1102, 1 (alc). Aulopus filamentosus: MNCN 1 (c&s). Lepisosteus osseus: ANSP 107961, 2 (alc); ANSP 1170, 6 (alc). Bathylagus euryops: MNCN 124597, 1 (alc). 172630, 1 (alc); MNCN 246557, 1 (c&s). Lepisosteus Bathylagus longirostris: USNM 384823, 2 (alc). Bathylagus platyrhincus: AMNH 74789, 2 (alc). Polypterus bichir: tenuis: MNHN 2005-1978, 2 (alc). Chlorophthalmus MNCN 1579, 7 (alc), 1 (c&s). Psephurus gladius: CASW, agassizi: MNCN 1193, 3 (alc); MNCN 1182, 5 (alc). uncatalogued, 1 (alc). Elopomorphs: Albula vulpes: MNCN Coregonus lavaretus: MNCN 75424, 1 (alc). Coregonus 52124, 2 (alc). Anguilla anguilla: MNCN 41049, 3 (alc). tugun: MNCN 75422, 2 (alc). Esox lucius: MNCN 197706, Elops lacerta: LFEM, 2 (alc). Elops saurus: MNCN 48752, 5 (alc). Galaxias maculatus: USNM 344889, 2 (alc). 2 (alc). Conger conger: MNCN 1530, 5 (alc). Eurypharynx Osmerus eperlanus: MNCN 193795, 11 (alc). Osmerus pelecanoides: AMNH 44315, 1 (alc); AMNH 44344, 1 (alc). mordax: USNM 32565, 2 (alc). Plecoglossus altivelis: Megalops cyprinoides: MNCN 48858, 3 (alc). Notacanthus MNCN 192036, 1
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